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### Description
I am working on extending $hfl and $hflc to support some more headers.
During some experimentation, I stumbled into some weird behavior regarding
$(hfl(Route)[-1]) and negative indexing of $hfl pseudo-variable (also for Via,
Contact).
Per the [docs
](https://www.kamailio.org/wikidocs/cookbooks/devel/pseudovariables/#hflname-header-field-with-list-of-bodies
): -1 index should print the last header found and so on (as stated by $hdr
$hfl).
Right now, -1 produces null, and from -2 and onwards it prints correctly from
the last one to the first one.
### Troubleshooting
#### Reproduction
```
#kamailio.cfg
...
request_route {
xlog("L_INFO", "Route headers hdr: $hdr(Route)\n");
xlog("L_INFO", "Route headers hfl: $hfl(Route)\n");
xlog("L_INFO", "Route headers count: $hflc(Route)\n");
xlog("L_INFO", "Route headers 0: $(hfl(Route)[0])\n");
xlog("L_INFO", "Route headers 1: $(hfl(Route)[1])\n");
xlog("L_INFO", "Route headers 4: $(hfl(Route)[4])\n");
xlog("L_INFO", "Route headers -1: $(hfl(Route)[-1])\n");
xlog("L_INFO", "Route headers -2: $(hfl(Route)[-2])\n");
xlog("L_INFO", "Route headers -3: $(hfl(Route)[-3])\n");
...
}
```
Seng a SIP message containing Route (but also applicable for VIA, Contact
headers):
```
OPTIONS_MSG_2CONTACTS="OPTIONS sip:example.com SIP/2.0
Via: SIP/2.0/UDP 192.168.1.100:5060;branch=z9hG4bK123456789
Max-Forwards: 70
From: <sip:b...@example.com>;tag=123456789
To: <sip:al...@example.com>
Call-ID: 987654321@192.168.1.100
CSeq: 1 OPTIONS
Contact:
<sip:b...@example.com>;expires=3600,<sip:b...@example.com>;expires=3600,<sip:b...@example.com>;expires=3600
Route: <sip:server1.example.com;lr;ftag=1234>,
<sip:server2.example.com;lr;ftag=5678>, <sip:server3.example.com;lr;ftag=9012>
Route: <sip:server4.example.com;lr;ftag=1234>,
<sip:server5.example.com;lr;ftag=5678>
Content-Length: 0
"
echo -e "$OPTIONS_MSG_2CONTACTS" | nc -u localhost 5060
```
See logs for logging details.
#### Log Messages
<!--
Check the syslog file and if there are relevant log messages printed by
Kamailio, add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
-->
```
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers hdr:
<sip:server1.example.com;lr;ftag=1234>, <sip:server2.example.com;lr;ftag=5678>,
<sip:server3.example.com;lr;ftag=9012>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers hfl:
<sip:server1.example.com;lr;ftag=1234>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers count: 5
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers 0:
<sip:server1.example.com;lr;ftag=1234>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers 1:
<sip:server2.example.com;lr;ftag=5678>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers 4:
<sip:server5.example.com;lr;ftag=5678>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers -1: <null>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers -2:
<sip:server5.example.com;lr;ftag=5678>
INFO: {1 1 OPTIONS 987654321@192.168.1.100} <script>: Route headers -3:
<sip:server4.example.com;lr;ftag=1234>
```
### Possible Solutions
<!--
If you found a solution or workaround for the issue, describe it. Ideally,
provide a pull request with a fix.
-->
In
https://github.com/kamailio/kamailio/blob/e59c4415707f0995a0d5315b5601ae518b4f1ed5/src/modules/pv/pv_core.c#L2145C2-L2163,
the count should start at 0 ie.
```
n=0; // not n=1;
```
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
(paste your output here)
```
* **Operating System**:
<!--
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
(paste your output here)
```
--
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